chore: initial commit — UdyamLinc UI, phases A-E

Vite/React 19 console and enterprise PWA. Officer console screens, offline
ledger and sync, data feeds and trip-wire rules screens with freshness chip.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

public/manifest.webmanifest

@@ -0,0 +1,15 @@
+{
+  "name": "UdyamLinc — उद्यम हिसाब",
+  "short_name": "UdyamLinc",
+  "description": "Cash-flow forecast and early warning for microenterprises. Works offline.",
+  "start_url": "/app",
+  "scope": "/",
+  "display": "standalone",
+  "orientation": "portrait",
+  "background_color": "#06301f",
+  "theme_color": "#0b5d3b",
+  "lang": "hi",
+  "icons": [
+    { "src": "/udyamlinc-tile.svg", "sizes": "any", "type": "image/svg+xml", "purpose": "any maskable" }
+  ]
+}

public/sw.js

@@ -0,0 +1,54 @@
+/*
+ * UdyamLinc service worker — app-shell precache + stale-while-revalidate.
+ *
+ * Scope of the offline promise (deck feature 7): the enterprise PWA must open,
+ * render and accept ledger entries with zero connectivity. Ledger writes are
+ * queued in localStorage by the app itself (see lib/ledgerStore.ts); this worker
+ * only guarantees the shell and its assets are reachable.
+ */
+const CACHE = 'udyamlinc-v1'
+const SHELL = ['/', '/app', '/index.html', '/manifest.webmanifest', '/udyamlinc-tile.svg']
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(caches.open(CACHE).then((c) => c.addAll(SHELL)).then(() => self.skipWaiting()))
+})
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches
+      .keys()
+      .then((keys) => Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k))))
+      .then(() => self.clients.claim()),
+  )
+})
+
+self.addEventListener('fetch', (event) => {
+  const req = event.request
+  if (req.method !== 'GET') return
+
+  const url = new URL(req.url)
+  // API calls are never served stale — the app falls back to its local store instead.
+  if (url.pathname.includes('/api/')) return
+
+  // Navigations: network first, fall back to the cached shell when offline.
+  if (req.mode === 'navigate') {
+    event.respondWith(fetch(req).catch(() => caches.match('/index.html')))
+    return
+  }
+
+  // Assets: cache first, refresh in the background.
+  event.respondWith(
+    caches.match(req).then((hit) => {
+      const network = fetch(req)
+        .then((res) => {
+          if (res.ok) {
+            const copy = res.clone()
+            caches.open(CACHE).then((c) => c.put(req, copy))
+          }
+          return res
+        })
+        .catch(() => hit)
+      return hit || network
+    }),
+  )
+})

public/udyamlinc-tile.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" width="64" height="64">
+  <defs>
+    <linearGradient id="ul" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0%" stop-color="#1e7a46"/>
+      <stop offset="100%" stop-color="#0b5d3b"/>
+    </linearGradient>
+  </defs>
+  <path d="M32 3 58 17.5v29L32 61 6 46.5v-29z" fill="url(#ul)"/>
+  <path d="M34.5 15 20 36h10l-2.5 13L44 27H33.5z" fill="#f2b544"/>
+</svg>